Two-Phase Flow Effects on Seismic Wave Anelasticity in Anisotropic Poroelastic Media

Juan E. Santos, José M. Carcione and Jing Ba
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Juan E. Santos: School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China
José M. Carcione: National Institute of Oceanography and Applied Geophysics—OGS, 34010 Trieste, Italy
Jing Ba: School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China

Energies, 2021, vol. 14, issue 20, 1-16

Abstract: We study the wave anelasticity (attenuation and velocity dispersion) of a periodic set of three flat porous layers saturated by two immiscible fluids. The fluids are very dissimilar in properties, namely gas, oil, and water, and, at most, three layers are required to study the problem from a general point of view. The sequence behaves as viscoelastic and transversely isotropic (VTI) at wavelengths much longer than the spatial period. Wave propagation causes fluid flow and slow P modes, inducing anelasticity. The fluids are characterized by capillary forces and relative permeabilities, which allow for the existence of two slow modes and the presence of dissipation, respectively. The methodology to study the physics is based on a finite-element uspcaling approach to compute the complex and frequency-dependent stiffnesses of the effective VTI medium. The results of the experiments indicate that there is higher dissipation and anisotropy compared to the widely used model based on an effective fluid that ignores the effects of surface tension (capillarity) and viscous flow interference between the two fluid phases.

Keywords: capillary pressure; two-phase fluids; porous medium; anisotropy, attenuation; finite elements (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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